Abstract: A bone screw comprises a shaft defining a longitudinal axis and a minor diameter. The shaft including a core having an angled surface relative to the axis. The angled surface extending from the minor diameter adjacent a proximal portion of the shaft to a distal portion of the shaft, and a wall disposed about the angled surface. The wall including at least one thread having an external thread form. In some embodiments, systems, spinal constructs, surgical instruments and methods are disclosed.

Abstract: A help summoning device for a disabled motor vehicle includes a base housing securable to the vehicle and defining a battery compartment and a first pin socket mast mounting member electrically connected to the battery. A telescopically extendable mast having two sections axially collapsible to substantially the length of one section but remaining elongated once extended is hollow and includes a second pin socket in its base which can be coupled to the first pin socket to assemble the device. A bulb socket is secured in the upper end of the mast with electrical wires extending through the mast and being of sufficient length to extend between and interconnect the bulb socket and the second pin socket. A brightly colored rigid flag is secured to the upper mast section with a portion of the flag relieved around the bulb socket which receives a flasher bulb and a lens surrounding the bulb and engaging the upper end of the mast in the relieved portion of the flag.